(idiomatic) In a manner which adheres strictly to rules, legal requirements, or official procedures.

present participle of book

The act or process of writing something down in a book or books, e.g. in accounting. / A reservation for a service, such as travel or hotel accommodation.

simple past tense and past participle of book

plural of booking

(idiomatic) Adhering strictly to rules, legal requirements, or official procedures.

Archaic spelling of book.

plural of booke

(slang) To take off quickly; to leave in a hurry.

(obsolete) Full of book-knowledge; stuffed with ideas gleaned from books.